An investigation of the flow of water through submerged orifices and pipes . of digression. Since the pipe wasthe same for all the mouthpiece experiments, the veloci-ties in all the runs had much the same range and the di-agrams are easily comparable. In Fig. 16 to 30 inclusivemay he found diagrams showing the data experimentally de-termined. IV. COMPARISON OF RESULTS. 11. Effect of Variation of The observed effectof variation of head on the coefficients of discharge andloss was in accord with the results noted in the threeprevious investigations made on this subject. One prominent elem
An investigation of the flow of water through submerged orifices and pipes . of digression. Since the pipe wasthe same for all the mouthpiece experiments, the veloci-ties in all the runs had much the same range and the di-agrams are easily comparable. In Fig. 16 to 30 inclusivemay he found diagrams showing the data experimentally de-termined. IV. COMPARISON OF RESULTS. 11. Effect of Variation of The observed effectof variation of head on the coefficients of discharge andloss was in accord with the results noted in the threeprevious investigations made on this subject. One prominent element in the results is the point atwhich the coefficients of discharge and loss commence tovary markedly from a constant value. The diagrams havethe same general characteristics as those obtained fromprevious experiments. Fig. 5 indicates the effect whichaccuracy and care in the experimental work have on theposition of the curve. The experiments made in 1906 shov/edthat the coefficients were constant at velocities higherthan ft. per sec. to ft. per sec. The present. i 20 series were made at velocities lower than this, and thecoefficients were the same as those ohtained for the high-er velocities and remained constant until a much slowervelocity than the limiting value named ahove. The reason for this change in the position of a partof the curve was not at first apparent. In the first ex-periments on the 1 1/2—in. round orifice, no runs weremade at velocities between ft. per sec. and sec. and a curve was drawn in the position shown bythe dotted line. Pince the coefficients at the low headswere so different from those at higher heads, a carefulattempt was made to check the results. This resulted inobtaining a second point very close to the first one at avelocity of ft. per sec. and several points ft. per sec. These last points were on a continuationof the straight line first ohtained (constant coefficient)and this line was therefore exte
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